New Vanity Pets from Pet Battles

The easiest way to get a lot of new vanity pets from WoD is probably going to be getting them from Pet Battles. Most of the other new battle pets will require achievements or questing to be done, but as soon as you have access to all the zones you should be fine to get all all those that are trapped in pet battles.

There are currently 26 new pets from battles and if you want to prepare so you know which zones they are located in you can check this list.
The pets with a * next to them are available in multiple zones. 

Gorgrond  Amberbarb Wasp                                                      Axebeak Hatchling Junglebeak Mudback Calf Parched Lizard Twilight Wasp* Wood Wasp Frostfire Ridge Frostfur Rat Frostshell Pincher Icespine Hatchling Ironclaw Scuttler Twilight Wasp* Shadowmoon Valley Moonshell Crab Mossbite Skitterer Royal Moth* Waterfly* Zangar Crawler

Spires of Arak Bloodsting Wasp  Golden Dawnfeather Mud Jumper* Swamplighter Firefly Thicket Skitterer Talador Brilliant Bloodfeather Flat-Tooth Calf Kelp Scuttler Mud Jumper* Royal Moth* Shadow Sporebat Waterfly* Nagrand Leatherhide Runt Mud Jumper*

Have fun catching them all! :)